docs: def sort(self, sort='score'):
          """
          This method retrieve an iterable object that implements the method
          __iter__. The arguments given will compose the parameters in the
          request url.
  
          This method can be used compounded with query, filter,
          order and facet methods.
  
          kwargs: valid SORT_VALUES arguments.
  
          return: iterable object of Works metadata
  
          Example 1:
              >>> from crossref.restful import Works
              >>> works = Works()
              >>> query = works.sort('deposited')
              >>> for item in query:
              ...     print(item['title'])
              ...
              ['Integralidade e transdisciplinaridade em equipes multiprofissionais na saúde coletiva']
              ['Aprendizagem em grupo operativo de diabetes: uma abordagem etnográfica']
              ['A rotatividade de enfermeiros e médicos: um impasse na implementação da Estratégia de Saúde da Família']
              ...
  
          Example 2:
              >>> from crossref.restful import Works
              >>> works = Works()
              >>> query = works.sort('relevance')
              >>> for item in query:
              ...     print(item['title'])
              ...
              ['Proceedings of the American Physical Society']
              ['Annual Meeting of the Research Society on Alcoholism']
              ['Local steroid injections: Comment on the American college of rheumatology guidelines for the management of osteoarthritis of the hip and on the letter by Swezey']
              ['Intraventricular neurocytoma']
              ['Mammography accreditation']
              ['Temporal lobe necrosis in nasopharyngeal carcinoma: Pictorial essay']
              ...
          """
          context = str(self.context)
          request_url = build_url_endpoint(self.ENDPOINT, context)
          request_params = dict(self.request_params)
  
          if sort not in self.SORT_VALUES:
              raise UrlSyntaxError(
                  'Sort field specified as %s but must be one of: %s' % (
                      str(sort),
                      ', '.join(self.SORT_VALUES)
                  )
              )
  
          request_params['sort'] = sort
  
          return self.__class__(request_url, request_params, context, self.etiquette)